Fixes for -Wunused-function on Linux, Android and ChromeOS

chrome/browser/local_discovery/privet_traffic_detector.cc

Index: chrome/browser/local_discovery/privet_traffic_detector.cc
diff --git a/chrome/browser/local_discovery/privet_traffic_detector.cc b/chrome/browser/local_discovery/privet_traffic_detector.cc
index c26269893aefbc2032548ca8b878da686da48f22..e95c74f6ad31ed917fcd55e52dcf13fef3f2bedb 100644
--- a/chrome/browser/local_discovery/privet_traffic_detector.cc
+++ b/chrome/browser/local_discovery/privet_traffic_detector.cc
@@ -44,12 +44,6 @@ void GetNetworkListOnFileThread(
                                    base::Bind(callback, ip4_networks));
 }
 
-bool IsIpPrefixEqual(const net::IPAddressNumber& ip1,
-                     const net::IPAddressNumber& ip2) {
-  return !ip1.empty() && ip1.size() == ip2.size() &&
-         std::equal(ip1.begin(), ip1.end() - 1, ip2.begin());
-}
-
 }  // namespace
 
 namespace local_discovery {